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Their are i believe 4 different VB's out there so you need to make sure you have the same one that came out off your car......and i can tell you for a fact the 05 wont work in the 03.
It is not recommended at all to swap VB's with others even if it is the same year. Dont risk messing up your Transmission just buy a brand new VB upgrade and TQ converter and you should be set.